Carbureter.



PATENTBD FEB. 19, 1907.

L. RENAULT. IGARBURETEB..

APPLIOATION rxLBD MAY ze, 1905.

4 SHEETS-SHEET 1.

PATENTED PEB. 19, 1907.

L. RENAULT.

GARBURETER.

APPLIOATION FILED MM 29, 1905.

4 SHEETS-SHEET 2.

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PATENTED FEB. 19, 1907. L. RENAULT.

CARBURETER.

APPLIGATION FILED MAY 29, 1905.

PATENTBD FEB. 19, 1901.

L. RENAULT. GA'RBURETER. APPLIoATIox, FILED MAY ze, mos.

4 SHEETS-SHEET 4.

iran sTi/rrnsN PATE i Specification of Letters Patent.

Patented Feb. 19, 1907.

' Application filed May 29, 1905. Serial No. 282.887.

To @ZZ whom it may concern:

Be it known that I, LOUIS RENAULT, a citizen of the French Republic, residing at Billancourt, Seine, France, have invented certain new and useful Improvements in Car-v bureters, of which the following is a speciication.

This invention has for its object to provide, in connection with the carbureter of an internal-combustion oil-engine, a regulating device operated by the vacuum produced by the engine in the passage supplying air to the carbureter instead of by the vacuum created in the carbureter itself.

According to this invention in the suctionpassage by which air is supplied to the carbureter is arranged adisk or equivalent device for regulating the available airway through the said suction-passage, the said disk or the like being subjected to the action of the vacuum produced by the engine, the

' variations of the vacuum causing the disk or the like to operate to vary the introduction of air. As the movements of the disk or the like are directly proportional-to the s eed of the engine, it is possible to utilize t e said disk or the 4like for regulating the speed of the engine by causing the said 'disk lor the like to act on a valve, `so as to regulate the supply of petrol or other oil (I will refer to it as petrol) to the spraying-nozzle, or the disk or the like may be .caused to operate a regulating device in the suction-pipe of the engine.

In the accompanying drawings, Figure 1 is a vertical section of a carbureter provided with a device in accordance with this invention, and Figs. 2, 3, 4, and 6 illustrate modiications as hereinafter described. Fig. 5 is a section through line A A of Fig. 4. Fig. 7

4is a section through line B B of Fig. 6.

' The carbureter comprises a reservoir 1 for the petrol, which reservoir is iitted with a float, so that the petrol reaches the sprayingnozzle 2 at a constant level. The petrol passes from the reservoir 1 to the sprayingnozzle 2 through two passages 3 and 4, be-

tween which a plug-valve 5 is provided for,

the purpose of stopping the supply of petrol to the nozzle vwhen required.

The suction-pipe of the engine is connected to the upper part 6 of the mixing-chamber. In the said mixing-chamber is a throttlingtube 7, surrounded by an annular space 8, forming a jacket ,through which hot water orga'ses can circulate forrthe purpose of heatinff. the carbureter. Below the throttlingtu e 7 opens a pipe 9, communicatin with the lower art of a chamber 10, whic contains the a oresaid disk 11, which occupies so much of the cross-sectional area of the said chamber 10 as to leave only a small space between the rim of the disk-and the wall of the chamber, the cross-sectional area of which said space being equal to or less than the cross-sectional area of the aforesaid' throttling-tube 7. In this manner all the variations of the vacuum roduccd by the engine are transmitted to t esaid disk 11, which is mounted on a spindle 12, carrying a hollow piston 13, capable of sliding in a cylinder 14 in the upper part of the aforesaid chamber 10, which is separated from the lower part by a division, the said cylinder 14 being rovided with openings which can be covcre and uncovered by the said hollow piston 13. The said openings establish communication between the .lower part of the aforesaid chamber 10 and the upper art 15, which is connected by a pipe 16 wit 1 the mixing-chamber above the spraying-nozzle 2, through which ipe 16 air is admitted to the mixing-chamer. Between the aforesaid disk 11 and hollow piston 13 the chamber 10 is provided with. openings 17, through which external air enters. The upper end of the spindle 12, carrying the disk and hollow piston, is screwthreadcd and passes through a screw-nut, so that the disk cannot move vertically without having a rotary motion imparted to it. This arrangement deadens the Jerks imparted to the disk 11 by the suction of the engine and causes the disk and hollow piston to move slowly vertically.

The lower end of the spindle 12, carrying the disk and hollow piston, rests on a support pressed upward by a spring 18, which tends to keep the disk in a raised position. On the upper end ofthe said s indie 12 hears a lever 19, fulcrumed at 20 etween its ends and with one end extending over the u per end of the s indle 21 ofthe aforesaid pfiig-valve which) controls the supply of petrol 10 to the spraying-nozzle, a spring 22 causing the lever 19 to press constantly on the spindle carrying the disk and hollow piston, which under the action of the spring 18 at the lower end thereof tends constantly to rise and to raise the lever 19 against the action of the spring 22, so that the end of the lever 19is normally kept away from the top of the spindle 21 of 'the plug-valve.

IOO

IIO

The operation of the apparatus is asn folengine and the'vacuumlunder thedisk 11 are lows: 'W hen the inotor is at rest, the disk l1 decreased,. and the said disk then tends to is in its elevated position, while the openings rise under the' action of the spring. 18., pres'sprovidedv in the aforesaid cylinder 14 are ing it u'wa'rd. The upper end of the spindle' closed by the hollow piston 13. The engine 12 ofv t e disk and hol ow piston then exerts, 7o

during the first strokes .of its piston will only a thrust on tli'e lever 19 such as to again open draw 1n the quantity of airlthat can pass bethe valve 26, y

tweenthe disk 11 and the sides of the cham- In another modification of the arrainfie-V '1 ber 10, in which'it is situated; but these suc'- rment, Fig.'3, the regulation is effect"e, d b y ro cessive suctions produce a vacuum whichmeans of a drum orpStOnWaheQLa-ndthe '75 tends to depress the disk 11 anditsspindle lever 19 i's bell-cranked, o' 'e ain/being. klpv 12, and the downward motion of the spindle in contact by a spring 22 with the-top orA 1,2 operates the hollow piston 13 so as to adspindle` 12 of the disk and hollow iston, the mit an additional quantity of air to the miX- other' arrn of the sai-d bell-crank evier actu?- r: 5 ing-chambeulthereby insuring the constancy` atingthe drum or piston-valve .27., 80 of the mixture. If the speed of the engine the disk 11y descends under the action of and the descent-of the spindle 12 be suflivacuum created by the engine-piston, the cient; the aforesaid lever 19 is caused by its y bell-crank lever 19 turns on vits 'fulcrmn 2t).v spring 22 to bear von the upper end of the and causes the drum or piston-valve 2-7 .to

2o plug-valve spindle 21, thereby compressing' contact or close the passage-way throughzthe 85- a spring 23, (which spring surrounds thesuction-pipe 6. .If the vacuum below thefdisk4 plug valve. spindle and normally keeping decreases, thev disk is raised again by the the plug-valve open,) and the plug-valve is spring 1S lbelow thespindle of the :diskand thereby caused to close the passage through hollowpiston, and thiscau'ses the leverto turn 25 which petrol passes to the spraying-nozzle. on its fulcrurn, so as toallow the drum or pis;- 9e A monentary stoppage or decrease of speed ton-valve. to be returned bya spring 28 (surtakes place, and'there is reduced vacuum unrounding its spindlef) to the position vin which der the disk-11, which tends to rise again unthe suction-,pipe 6 is opened more fully; v

' der the action of the spring 18 beneath its In the modification shown on Figvd the 3o spindle. The said spindle on rising again carbureter is provided with a cockorvalve 95 'y raises the lever 19, so that it ceases to act on which can be operated to regulate the admis-' the plug-valve spindle 21, which, under the mion of air to lthev carbureter without intervaction of its spring 23, rises, and the plugfering with the automatic action ofthe' carvalve opens, and the petrol can pass again to bureter and with means for controlling'l the' 3 5 the spraying-nozzle 2, and at the same time additional air-inlets'by 'altering their dimenrell the supply of air isdecreased. When the en- 'sions simultaneously in each direction. The ine regains its speed, vacuum is again crecarbureter is also provided with an improved ated under the disk 11, which again descends spraying-nozzle which permits of the hydro with its spindle 12, and soon while the engine carbon fuel which Iwill refer toas petrol.)

4o' is at work.' being supplied proportionally to the powerl 105" To'rrake the apparatus adjustable, the end exerted by the motor, vall as-hereinafter. .deof the lever 19, which acts on the plug-valve scribed. I arr-ange a lcock 'or valve 29- bef spindle 21, is pro vided with -a screw 24, passtween the air-supply pipe and the cham# ing through the said end of thelever land actber 1,0, in which the aforesaid disk or the like ing asthe medium for bearing on the plugis situated, he sald cock or valvepermi-tting I Io l valve spindle, so that the time of closing the of a regulated quantity of an' passing from plug-valve can be varied by operating this the said supply-pipe 30 to the ,saidcharn'ber screw. rl`he lever on the other side of its ful- 1() without passing between the space .be-v crum 20'is extended, and by depressing this tween the aforesaid disk -or the like 11 .and

5o extension 25 the lever: 19 will be raised, so'v the sides ofthe chamber 10. The spindle of 115 that the regulating action of the aforesaid the diskor the like 11 has keyed on it avalve arrangement can be suspended vwhen so de-A 13, capable of'covering openings'31.,' nosired. vided -in the cylinder -inclosing this va ve.. In a modified form .of the arrangement This valveand the disk-or the like .connected i shown in Fig. 2 the motion of the disk 11 is therewith have impartedthereto when they lo utilized to operate a butterfly-valve 26, armoveverticallyfa helical motion which Ais ranged in the suction-pipe 6 of the engine. effected by means .of a-quck threadedscrew. In this modification when. the disk 11 is 32 on the spindle 12 engagingin a similarlycausedto descend by the' suction of the enthreaded nut. A'spring 18'., bearing on the 6o gine-piston the lever 19 (kept in Contact with head ofthe spindle 12, tends to keep thedisk 12 5.

the screwed upper end of the spindle 12 of `in its lowest os'ition. The spraying-nozzle .the disk and hollowpiston, as before, .by a 2"is of -consi erable length and is Apro-vided l "spring 22? .tends to close the aforesaid valve. witha rst or lower aperture 33, situated, 26 and restrict theadir ission ofthe carburet` Vsayftwo or three millimeters abovetheeonf-A 65. ed an to'thngine, so that ihespsedafthe, itat-iets ef finapeeouaaa ausweisen;

or lower aperture the said nozzle has other. apertures variable in number and arranged along the said nozzle. These apertures cause the carbureter to be supplied with petrol in quantity varying with the power being exerted by the motor, this variation of such supply resulting'from the variation ol level produced in the nozzle by the suction of the piston or pistons of the motor. Thus when there is no load on the motor and it runs at low speed the petrol will rise but little in the nozzle, because the suction is very low, and petrol only passes through the lower apertures of the nozzle; but when'load is thrownv on the motor and its speed increases the suction increases, the petrol rises in the nozzle and passes through the higher apertures as well. The air admitted directly from the air-inlet pipe 3() into the chamber 10 of the disk or the like through the aforesaid cock or valve 29 causes the suction acting on the disk or the like l1 to vary, n'iodi'lies the movement ot the said disk or the like, and causes the apertures 31 in the cylinder in which the aforesaid valve 13 works to be opened so as to admit additional air. The direct admission of air from 'the air-supply pipe 30into the chamber 10 of the disk or the like has for its object to vary slightly the proportions of air and petrol, so as to obtain an explosive mixture as perfect as possible under all con ditions of altitude and atmospheric temperature and also to correct the differences which exist between different liquid fuels that may be used. The additional entrance of air through the aforesaid coekpr valve 29 does not prevent the automaticl operation ofthe apparatus. ply pipe to the chamber 10 of the disk or t e like be restricted or shut otf'bymeans of the aforesaid cock orvalve 29, the vacuum above the disk or the like 11 increases, thus Cassin the additional air-inlets 31 in the cylhide. above to open more rapidly and to a greater extent. lf, however, air be allowed to pass through the said cock or valve from the airsupply pipe 30 to the chamber 10 above the disk or the like, the vacuum or force due to suction above the disk 11 is decreased and theadditional air-openings above are opened less rapidly and to a lesser extent for the same suction produced by the motor As very slight variations of the vacuum or suction cause considerable variations in the level of the petrol in the nozzle-tube, it is easy to utilize these variations of the level to vary the supply of the petrol in accordance Vith the vacuum or suc tion produced. When the motor is starting and running at its lower speeds, the lower aperture or apertures of the nozzle alone supply the petrol; but when the speed and power of the motor increase the apertures above'also supply petrol successively until the maximum supply of petrol, and consequently of power, is reached, -and If the passage from the air-su the aperture 35.

3.75 uit) then the vacuum or suction is sufiiciently high to cause the disk or the like to operate the valve 13 -in the cylinder above to fully open the additional air-inlets in the said cylinder above the said disk or the like. automatic action of the carburetor' .is thus obtained at the lower powers and vacua or suctions by the different quantities of'petrol passing through the nozzle, while at the higher powers and vacua or suctions the automatic action is secured also by the gradual opening of the additional air-inlets in the aforesaid cylinder. n

In the Inodiiication shown' on Fig. (S the height of the tube-nozzle is reduced. As described for the niodi'lication shown on Fig. 4, the vacuum. produced by the suctionstroke of the motor causes the petrol to riso in a spraying nozzle or .tube provided with several apertures, which supply petrol successively. In the carburetor shown on Fig. 6 a special arrangement is provided, whereby the height of the nozzle or tube is considorally decreased, although the second apertule, hereinafter described, begins to work only when a high vacuum has been created in the carburetor. Itv is also possible to cause this second aperture to come into ac` tion under predetermined conditions, as hereinafter described. two apertures, 34 being the normal aperture, and 35 the other or second aperture, provided at the top ot the spraying nozzle or tube, which extends upward into a chamber 36.- Between the spraying nozzle or tube 22 and the wall of an aperture provided in the bottoin of the chamber 36, through which opern ture the saidnozzlo passes into the said'ehamber, an annular passage 37, having a definite area in cross-section, is left. The chamber 36 is also provided at top 'with another aperture 38, the crosslsectional area of which is larger' than that of the annular passage 37. .lf-a vacuum is formed in the carbureter, it is obvious that this vacuum tends to cause acertain quantityof air to enter through the aperture 38 and the annular' passage 37. As the area ofthe aperture 38 is greater than that of the annular passage 37 the chamber 36 is subjected to a pressure which is intermediate between atn'iosphoric pressure and the pressure existing inside the carhureter. By varyilig the area of the aperture 33 relatively to that of the annular passage 37 a predeterniined ratio between the vacuum in the chamber 36 and that existing in the carbureter may be secured. This ratio is so chosen that the liquid fuel issues through the opening 35 onlyv under predetermined conditions. ln other words, the partial vacuum or kind of expansion thus produced in' vthe chamber has for its object to retard the low of liquid through ln practice the ratio of the area ot the annular passage 37 to the area of the aperture 3S is such that the aperture 35 The y ICO fis

Having now partieuliily. deseiibed and ascerta'if'neclrthe nature of my invention and in wli'ati manner the same lis to be performed,

1. A "a'rbureber paving "a ehamber Apro- ,Vdd Wthnhpenlng 'to 'supply air', to thej miningfehanber an en zine, a disk movable in, and'fgeeA ofthe :Wallev the Chamber, said disk being'op'erable by the vaeuurnoreated by the engine, a,valve to lose said opening and'operable bythe d i'sk when the latterjis under the f action of the "vauurn ;to uncover. 'said' openin`g,` a' lspindle earryilng said disk and. provided 'witha Barew, fa 'iXed through thegseifeweiitends and with which. it engagesandlneans bearing'against the spin- 1 die to aethagainst the disk in opposition to A oarliiire'ter 'having a chamber pro- Wdjwith 'an openingto supply air to the inliXing-ehaniber of an" engine,`a disk movable in, Aand'freeof the Wall of, theeliarnber, said 'exha'inber beingoperable bytlie vacuum ore- 'ated Vby said '|engine, a valve to lose said opening and operablelby-the disk when under A'the vaction of the vacuum to .unc-over said Yopening a valve 'tooo'ntrol the supply of gas- Yeo''s fluid lto ,`t,lie"s'aid mixing; chamber, rneehanisnioperable from the disk to actuate Said seeond valve, and aphi'd valve adapted;

to vary the richness f the explosive mixture 4 independent of the other valves.`

3. A oarbureter having aehainber provided with an opening -to supply airto the inixin '-ehamber of an engine, a disk movable in andgfree of the wall of the chamber, said `disk being operable .by the vacuum Created by the engine, a valve to close said opening and'operable by the disk when the latter is under the action of the vacuum to uncover said opening, a yieldingly-mounted spindle `Carrying said -disk, and provided with a screw,

a fixed nut inwhieh the screw engages, and a spring-operated lever .bearing against the spindle. I

4. A earbureteiji having. ahamber pro'- Yvided with an opening to supplyair'to the inixing-ehamber of an engine, a'disk movable 'in and free of the wall of tbe chamber,l said disk lbeing operable by the vacuum created by the engine, ,a valve to ,close said ,opening and operable by the disk when the litter under the action of the vacuum to unoover said opening, a yieldingly-mounted spindle carrying said disk and provided with a screw,

a fixed nut in whiehthe nscrew engages,v a'

springoperatedlever bearing against the spind e, and a'valve for governing the supply 'of gaseous 'fluid to said mixing-chamber and v operable by said lever.4

In testimony whereof I have hereunto set rny hand in presence of 'two subscribing witne'sses. l I

- LOUIS RENAULT.

Witnesses:

gEM'ILn KLQH', PIERRE LEisLE. 

